READ No safe lighting is completely safe, all films will become signifivantly fogged if exposed to safelights for long enough. • Are not perfect absorbers of the undesirable wavelength and, In truth all films have some sensitivity to all wavelengths. • This is because safelight filters. Thus, the Intensity of illumination and the film-handling time must be kept to minimum if significant fogging is not occur.

The first requisite of a processing room is the exclusion of all external ________ when radiographs are processed

Walls & Ceiling of Darkroom should have? SVCP

The room must be capable of being made completely _______ • It should not be damp or subjected to extreme of ________

Walls adjacent to the radlographic room should be shielded with what correct thickness of the lead all the way to the ceiling? In the interest of both darkroom staff and films materials alike

• should be Centrally located • Services by hatches from the adjacent imaging room • Away from hot or damp areas • Accessible in terms of power and water supply • Adjoining viewing room

Use orthochromatic film, which is sensitive to ultraviolet, blue, and green light.

Use green-sensitive film

Darkroom should have a minimum of __ air changes per hour All of these conditions can be archived by using a good air-conditioning

Darkroom can only be adjacent to exposure room only if: * Hollow blocks filled with _____ * Concrete greater than __ inches

Relative humidity is maintained at around __-__% • Room temperature maintained between __to__ degree Celsius

White lighting consists of? - Preferably centrally placed

Size of DarkRoom • Minimum floor area of • Celling height of • SIZE may be reduced depending upon the department needs.

used for for inspection and maintenance of the cassette And screens • Cleaning of work surfaces • Services of equipment

The walls and roofs should be painted by __ or ___ enamel as such a paint act as a good reflecting surface for safelight. • X-ray rotating _____ light in hallway switch "on" signaling that x ray machine is operating.

- The system that removes the used/waste water and solutions from processing tank? - All drainpipes/hose must be _____ towards their eventual outlet

HOW DOES A SAFELIGHT WORK? • When white light is passed through colored filters, certain wavelength (or colors) are absorbed by the filters, whilst those wavelengths, which correspond to the color of the filters will be transmitted. • Making the correct selection safelight filter (matching the filter to the film), means choosing a filter, which will transmit a color to which the film is relatively unresponsive, whilst stopping all light to which the film is most sensitive.

Enclosed area or chamber dimly lit by safelight (usually red) but otherwise intentionally lightproof room where films are handled and processed. Where everything starts and ends

_______ and ______ outlet should be provided • Sufficient space to accommodate a __ bench, a __ bench, and a ____ • Too ___ room is as undesirable as small room • Should be near the ____ examination room

5 Types of Entrance in Darkroom SDMLR

Darkroom Specifications LOCATION- In proximity/near to? SIZE:

Darkroom MUST have a __ & __ section _ ft away from each other. To prevent _______ of the each section.

________ _______ in film emulsions are extremely sensitive to visible light, and any light leaking around a door or window may fog and ruin the films.

Use blue-sensitive film

NOTE: If the safelight is not safe, you should do one of the following to correct the problem: RRC

The process of matching the color sensitivity of the film to the color emission of the intensifying screen.

5 Basic Test For Darkroom Facility CLWVP

FLOORS IN DARK ROOM SHOULD BE? NNCSDLAPP

light from safe lamp directly falls onto the work surface. ex. Beehive safelight - Minimum distance of ___ from working surface Best for loading and unloading areas

Permanent darkroom, ideally with the floor area of not less than __ sqm

- Directs the light towards the celling which reflects light back into the room • Is intended to provide general illumination of the dark room • Suspended atleast __ m above the floor.

range of light wavelength that a film can absorb.

• The darkroom wall should be constructed of solid concrete (__cm thick) have a lead box inside to store boxes of unexposed film currently in use.

important to match in radiography to produce high quality images.

the color of light produced by intensifying screen